1. Pneumomediastinum: old signs and new signs;Bejvan;AJR Am J Roentgenol,1996
2. Pneumomediastinum revisited;Zylak;RadioGraphics,2000
3. Pneumomediastinum revisited;Zylak;RadioGraphics,2000
4. Pneumomediastinum: a diagnostic problem;Cyrlak;Crit Rev Diagn Imaging,1984
5. Ventilator-related extra-alveolar air in adults;Rohlfing;Radiology,1976